Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest 13 km from here.
This alert expired on 21 September 2026 at 21:52 UTC. It is kept here as a record.
It is the 37th strongest of the 58 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 21 at 4:43PM CDT until September 21 at 4:45PM CDT by NWS Huntsville AL
Urban PEI: 505,985 within a heuristic 50 km radius; not unique people.
Nearby, since 10 March 2026
- March 10, 2026 · score 48 · 6.2 km
- June 21, 2026 · score 48 · 8.7 km
- June 20, 2026 · score 48 · 11.5 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 41 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 41 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 33.7060, -86.9314 |
| Nearest City | Birmingham (24 km) |
| Urban exposure index (PEI) | 506.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-21T21:43:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8c0f4f24072b140dd8cb438285849006da89309c.001.1 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-09-21T21:43:00.000Z.
First archived: 2026-09-21T21:47:06.890Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Marshall, AL; Etowah, AL; DeKalb, AL; Marshall, AL and 5 more areas |
| Headline | Severe Thunderstorm Warning issued September 21 at 4:43PM CDT until September 21 at 4:45PM CDT by NWS Huntsville AL |
| Expires | 2026-09-21T16:52:00-05:00 |
| SenderName | NWS Huntsville AL |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8c0f4f24072b140dd8cb438285849006da89309c.001.1","noaa_urn:oid:2.49.0.1.840.0.1e370d4ef2975abd912ce4ad5705228984ff02d7.001.1","noaa_urn:oid:2.49.0.1.840.0.6e720efb02f5bbc359443927ec0c4363dab3ca74.001.1","noaa_urn:oid:2.49.0.1.840.0.7d4abe82650693cd60d7fc38eab354322563682d.001.1","noaa_urn:oid:2.49.0.1.840.0.2d121e76b6bb57de59899533fb3d3a69ad4dc4db.001.1","noaa_urn:oid:2.49.0.1.840.0.c26be21e5665abca04e92469798be2a4a0c6ff12.001.1","noaa_urn:oid:2.49.0.1.840.0.d2f292f9b152ea739a11aaf8218b5250d509f6a9.001.1","noaa_urn:oid:2.49.0.1.840.0.28662ec89006b2776bfca0ab2a0a2c93afb9d3bb.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 ENE American Village |
| Spc County | Shelby |
| Spc State | AL |
| Spc Comments | Tree down and blocking CR 22 near Hidden Creek Lane and Calera Middle School. (BMX) |
| Iem TypeSummary | D |
| Iem City | 2 ENE American Village |
| Iem County | Shelby |
| Iem State | AL |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Review the area, threshold and delivery channel in your account.
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